Sandstone (Ferruginous)
Arenite (variable SiO2 with Fe2O3 staining)
sedimentary
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
Basalt
Extrusive mafic igneous rock
igneous
Fossiliferous Shale (with Vertebrate Bones)
Laminated Mudstone containing Fossilized Bone (Apatite)
sedimentary
Granite
Granite (Mainly Quartz SiO2 and Feldspar KAlSi3O8)
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Labradorite
Labradorite (a variety of Plagioclase Feldspar), Na(AlSi3O8) to Ca(Al2Si2O8)
Mineral
Basalt
Extrusive mafic igneous rock
igneous
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Sandstone (likely Arkose)
Arenite (Feldspathic Sandstone / Arkose)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Sandstone (with Iron concretions/staining)
Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)
sedimentary
Tektite (likely Australite)
Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)
Mineral (specifically a mineraloid)
Quartzite with Dark Mineral Inclusions
Quartzite (primarily SiO2) with accessory minerals
metamorphic
Sandstone (Red Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)
sedimentary
Greenstone (Amygdaloidal Basalt)
Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)
igneous
Sandstone
Arenite
sedimentary
Agate (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Granitoid (Granite/Diorite)
Course-grained Plutonic Igneous Rock
igneous
Greenschist
Chlorite schist
metamorphic
Granite (Phaneritic Igneous Rock)
Granite
igneous
Greenschist
Greenschist
metamorphic
Schist
Mica Schist
metamorphic
Greenschist
Greenschist facies rock (containing chlorite, actinolite, and epidote)
metamorphic
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose Pebble)
Clastic Sedimentary Rock (Litharenite/Quartz arenite)
sedimentary
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Sandstone (with Feldspathic/Arkose qualities)
Arenite (primarily SiO2 with KAlSi3O8 components)
sedimentary
Puddingstone
Conglomerate
sedimentary
Sandstone
Arenite/Quartz Arenite
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Granite
Intrusive igneous rock (Acidic)
igneous